The Siplast ParaLok Fastener is a factory-preassembled unit consisting of a tube, integral disk, and locking staple. The tube is fabricated from G-90 Galvanized coated steel, the 2.7-inch disk is ribbed and is fabricated from Galvalume-coated steel, and the locking staple is fabricated from coated high-tensile steel wire. ParaLok Fasteners are engineered to secure base sheets to appropriate decks/substrates such as poured gypsum and cementitious wood fiber and other approved deck/substrate types. On-site withdrawal testing should be performed to evaluate the ability of the roofing substrate to accept and retain fasteners.